Have seen several pics like this in the past, mostly from areas like Wash/Ore or Maine where logging in managed timber areas is prevalent. These toothy critters do a lot of damage to younger trees when they end up girdling them to eat the tender inner bark. This is also an effective method of selectively killing trees, and the USFS and other agencies will actually girdle pine trees in quakie stands, to improve the mule deer aspen cover.